Some of the rocks we see around us are millions of years old. Rocks don't stay the same forever, though. Rocks are changing and becoming new rocks all the time. Inside this book, readers will follow a clear, accessible, step-by-step journey through Earth's rock cycle. They will find out how igneous rock forms from magma following a volcanic eruption. Then they will explore how the igneous rock is eroded by rain to become sediment that eventually forms...